Pleasant is one of the main components of plant cell wall, which is divided into water-soluble pectin and insoluble pectin, namely rage gum.Because of its good emulsification, thickening and gel, it has a wide range of applications in food, textile, printing, tobacco, metallurgical.

Primenset is hydrolyzed into soluble pectin in dilute acid, and is further converted to galacturonic acid, and the product forms a purple compound in a strong acid with carbazole, and has a feature absorption peak at 530 nm.

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